View from space: Amazon deforestation 1975 to 2012 Posted by EarthSky in Earth August 1, 2012 Striking changes in two satellite images of the Amazon rainforest between 1972 and 2012. 75 years after the infamous Battle of Arnhem, rare photos reveal terrifying death and destruction as allied troops struggle to liberate Netherlands from the Nazis. Memorialised in the Hollywood blo.
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About This ImageA NASA Hubble Space Telescope 'natural color' image of the material surrounding the star Eta Carinae, as imaged by the Wide Field Planetary Camera 2 (WFPC-2).The Camera was installed in the Hubble Space Telescope during the STS-61 Hubble Servicing Mission. The WFPC-2 optically corrects for the aberration of the telescope's primary minor, restoring the telescope's vision to its originally planned clarity.Eta Carinae has a mass of approximately 150 times that of the sun, and is about 4 million times brighter than our local star, making it one of the most massive and most luminous stars known.Eta Carinae is highly unstable, and prone to violent outbursts. The last of these occurred in 1841, when despite its distance (over 10,000 light years away) Eta Carinae briefly became the second brightest star in the sky.Pre-servicing mission HST observations taken with the WF/PC-1 reveled new detail in the rapidly expanding shell of material which was ejected during the last century's outburst. However, the earlier effects of HST's spherical aberration obscured the structure of the material very near Eta Carinae itself.The clear view of Eta Carinae now provided by WFPC-2 dramatically demonstrates the ability of HST to reliable study faint structures near bright objects.The picture is a combination of three different images taken in red, green, and blue light. The ghostly red outer glow surrounding the star is composed of the very fastest moving of the material which was ejected during the last century's outburst. This material, much of which is moving more than two million miles per hour, is largely composed of nitrogen and other elements formed in the interior of the massive stir, and subsequently ejected into interstellar space.The bright blue-white nebulosity closer in to the star also consists of ejected stellar material.
Unlike the outer nebulosity, this material is very dusty and reflects starlight. The new data show that this structure consists of two lobes of material, one of which (lower left) is moving toward us and the other of which (upper right) is moving away.
The knots of ejected material have sizes comparable to that of our solar system.Previous models of such bipolar flows predict a dense disk surrounding the star which funnels the ejected material out of the poles of the system. In Eta Carinae, however, high velocity material is spraying out in the same plane as the hypothetical disk, which is supposed to be channeling the flow.This is quite unexpected. The WFPC-2 observations of Eta Carinae raise as many questions as they answer.Credits: Credit:, and J. Hester (Arizona State University)Keywords. About The ObjectObject NameA name or catalog number that astronomers use to identify an astronomical object.Object DescriptionThe type of astronomical object.R.A.
PositionRight ascension – analogous to longitude – is one component of an object's position.Dec. PositionDeclination – analogous to latitude – is one component of an object's position.ConstellationOne of 88 recognized regions of the celestial sphere in which the object appears.DistanceThe physical distance from Earth to the astronomical object. Distances within oursolar system are usually measured in Astronomical Units (AU). Distances between stars areusually measured in light-years. Interstellar distances can also be measured in parsecs.DimensionsThe physical size of the object or the apparent angle it subtends on the sky.About The DataData Description.
Proposal: A description of the observations, their scientific justification, and the links to the data available in the science archive. Science Team: The astronomers who planned the observations and analyzed the data.